Driving device for window blind

Abstract

A driving device includes a mounting frame, a driving rod, a driving gear, a worm, primary and auxiliary input members, and a reduction gear train. The mounting frame is connected to a frame unit. The driving rod is connected to a blind unit and is rotatable about a first axis. The driving gear is connected to the driving rod. The primary input member is rotatable about a second axis. The worm is connected to the primary input member and meshes with the driving gear. The auxiliary input member is rotatable about the second axis. The reduction gear train is connected between the primary and auxiliary input members, such that rotation of the auxiliary input member drives the primary input member to rotate at a speed different from that of the auxiliary input member.

What is claimed is: 
     
       1. A driving device adapted for a window blind, the window blind including a frame unit, and a blind unit that is mounted to the frame unit, said driving device comprising:
 a mounting frame adapted to be connected fixedly to the frame unit of the window blind; 
 a driving rod adapted to be connected to the blind unit, being rotatably mounted to said mounting frame, and being rotatable about a first axis for operation of the blind unit; 
 a driving gear co-rotatably connected to said driving rod; 
 a primary input member rotatably mounted to said mounting frame, and being rotatable about a second axis that is different from the first axis; 
 a worm co-rotatably connected to said primary input member, and meshing with said driving gear; 
 an auxiliary input member rotatably mounted to said mounting frame, and being rotatable about the second axis; and 
 a reduction gear train connected between said primary input member and said auxiliary input member, such that rotation of said auxiliary input member drives said primary input member to rotate at a speed different than that of said auxiliary input member; 
 wherein said primary input member is formed with a first axial hole that extends along the second axis, said driving device further comprising a first operation pole including a first shell body, a rotating member that is rotatably disposed in said first shell body, and a first engaging portion that extends outwardly of said first shell body and that is co-rotatably connected to said rotating member, said first engaging portion removably engaging said first axial hole such that said rotating member is co-rotatably connected to said primary input member for driving rotation of said primary input member. 
 
     
     
       2. The driving device according to  claim 1 , wherein said reduction gear train includes an annular gear that is co-rotatably connected to said primary input member, a sun gear that is co-rotatably connected to said auxiliary input member, and at least one planet gear that is rotatably mounted to said mounting frame, and that meshes with said annular gear and said sun gear. 
     
     
       3. The driving device according to  claim 1 , wherein said first engaging portion and said first axial hole have complementary polygonal shapes. 
     
     
       4. The driving device according to  claim 1 , wherein said first engaging portion exhibits magnetic characteristics. 
     
     
       5. A driving device adapted for a window blind, the window blind including a frame unit, and a blind unit that is mounted to the frame unit, said driving device comprising:
 a mounting frame adapted to be connected fixedly to the frame unit of the window blind; 
 a driving rod adapted to be connected to the blind unit, being rotatably mounted to said mounting frame, and being rotatable about a first axis for operation of the blind unit; 
 a driving gear co-rotatably connected to said driving rod; 
 a primary input member rotatably mounted to said mounting frame, and being rotatable about a second axis that is different from the first axis; 
 a worm co-rotatably connected to said primary input member, and meshing with said driving gear; 
 an auxiliary input member rotatably mounted to said mounting frame, and being rotatable about the second axis; and 
 a reduction gear train connected between said primary input member and said auxiliary input member, such that rotation of said auxiliary input member drives said primary input member to rotate at a speed different than that of said auxiliary input member; 
 wherein said auxiliary input member is formed with a second axial hole that extends along the second axis, said driving device further comprising a second operation pole including: 
 a second shell body; 
 an electromagnetic driving unit disposed in said second shell body; and having an output element that is rotatable relative to said second shell body; and 
 a second engaging portion extending outwardly of said second shell body and co-rotatably connected to said output element, said second engaging portion removably engaging said second axial hole such that said output element is co-rotatably connected to said auxiliary input member for driving rotation of said auxiliary input member. 
 
     
     
       6. The driving device according to  claim 5 , wherein said electromagnetic driving unit has a stator part that is mounted to said second shell body and that is able to be energized to generate a magnetic force, and a rotor part that is configured to rotate relative to said stator part by the magnetic force, and that serves as said output element of said electromagnetic driving unit. 
     
     
       7. The driving device according to  claim 6 , wherein said stator part has a plurality of electromagnetic coils. 
     
     
       8. The driving device according to  claim 5 , wherein said second engaging portion and said second axial hole have complementary polygonal shapes. 
     
     
       9. The driving device according to  claim 5 , wherein said second engaging portion exhibits magnetic characteristics. 
     
     
       10. The driving device according to  claim 5 , wherein said reduction gear train includes an annular gear that is co-rotatably connected to said primary input member, a sun gear that is co-rotatably connected to said auxiliary input member, and at least one planet gear that is rotatably mounted to said mounting frame, and that meshes with said annular gear and said sun gear.